Some of them look a bit complicated to administer full speed unless you've practiced the forms thousands of times at each possible angle to make them second nature, but a few, like http://www.youtube.com/watch?v=r7wK2_6kScY , look quite simple and useful. Also the fella teaching doesn't seem like a twat at all. I also like the little guy lifting up the huge seven foot, 300lb black dude in this one http://www.youtube.com/watch?v=npotdGwUPJI , although in real life he'd probably have already crushed his puny head with his bare hands.